CAT24C64WI-GT3 Detailed explanation of pin function specifications and circuit principle instructions
The component you're referring to, "C AT24C64 WI-GT3", is part of ON Semiconductor's product line. It is a 64 Kbit (8K x 8) Electrical ly Erasable Programmable Read-Only Memory (EEPROM), designed for various digital storage applications, particularly in devices that need non-volatile memory for configuration settings or data retention.
The CAT24C64WI-GT3 comes in a TSSOP-8 package, which is an 8-pin Thin Shrink Small Outline Package. This package provides a compact footprint and is often used in devices where space is limited.
Here’s a detailed explanation of the pin functions, followed by a FAQ section.
Pin Function Specifications for the CAT24C64WI-GT3 (TSSOP-8 Package)
Pin Number Pin Name Pin Function Description 1 A0 Address Pin 0 - Used to select the memory address in combination with other address pins. 2 A1 Address Pin 1 - Used in combination with A0 to set the memory address. 3 A2 Address Pin 2 - Used to select memory address, in conjunction with A0 and A1. 4 GND Ground - This pin connects to the ground of the system, providing a reference for voltage levels. 5 SDA Serial Data - This is the data input/output pin used in I2C communication. It is used to read and write data to the EEPROM. 6 SCL Serial Clock - This is the clock signal pin for I2C communication. It synchronizes data transfers between the EEPROM and a master device. 7 WP Write Protect - This pin is used to protect the memory from being written to when held low. When held high, the EEPROM allows writes. 8 VCC Power Supply - This pin provides the supply voltage to the EEPROM. Typically 2.5V to 5.5V.Detailed Pin Function List for the CAT24C64WI-GT3 (TSSOP-8 Package)
Pin 1 (A0):
Function: This is the least significant bit of the memory address. The address pins (A0, A1, A2) allow selection of one of the memory pages or blocks.
Usage: Used to select different memory locations when interface d with an I2C master. It's used to differentiate between several memory devices connected on the same bus.
Pin 2 (A1):
Function: The second least significant bit of the memory address.
Usage: Along with A0 and A2, it helps form the address that points to specific memory locations. When all address pins (A0-A2) are set high, it accesses the highest address in the memory.
Pin 3 (A2):
Function: The most significant address bit for selecting memory blocks.
Usage: It helps in selecting specific memory pages or blocks. Together with A0 and A1, it helps uniquely address each location in the memory.
Pin 4 (GND):
Function: Ground pin.
Usage: Connect this pin to the system ground to ensure proper functioning of the device. It serves as a reference voltage for the other pins.
Pin 5 (SDA):
Function: Serial Data (I2C Data Line).
Usage: Used for data transfer between the memory and an I2C controller or master device. Data is either written to or read from this pin in 8-bit packets. The communication protocol follows I2C standards.
Pin 6 (SCL):
Function: Serial Clock (I2C Clock Line).
Usage: This pin provides the clock signal that synchronizes the data transfer on the SDA pin. It is controlled by the master device.
Pin 7 (WP):
Function: Write Protect.
Usage: This pin prevents accidental data overwrite when set low. To enable writing to the EEPROM, this pin should be set high. The WP pin is particularly useful in applications where data integrity is crucial.
Pin 8 (VCC):
Function: Power Supply.
Usage: Provides the necessary voltage (2.5V to 5.5V) to power the EEPROM. This pin is critical for operation, and if the voltage is not within the specified range, the EEPROM may not function correctly.
CAT24C64WI-GT3 Pin Function FAQs
Q1: What is the purpose of pin A0 on the CAT24C64WI-GT3? A1: Pin A0 is used as the least significant bit in the memory address. It helps in selecting different memory pages when connected to the I2C master device.
Q2: Can I connect multiple CAT24C64WI-GT3 EEPROMs on the same I2C bus? A2: Yes, you can connect multiple devices. You just need to set different address combinations using the address pins (A0, A1, A2) to differentiate between the devices.
Q3: What happens if the WP (Write Protect) pin is set low? A3: When the WP pin is set low, it prevents any writing to the memory, effectively protecting the EEPROM from accidental data overwrites.
Q4: What voltage should be applied to the VCC pin? A4: The VCC pin should be powered with a voltage between 2.5V and 5.5V to ensure proper operation of the CAT24C64WI-GT3 EEPROM.
Q5: How does the I2C communication work on the CAT24C64WI-GT3? A5: The CAT24C64WI-GT3 uses the SDA (Serial Data) and SCL (Serial Clock) pins for communication. The master device generates a clock signal on SCL and transfers data on SDA.
Q6: What happens if I don’t connect the GND pin to ground? A6: The GND pin must be connected to the system ground; otherwise, the EEPROM will not function properly due to lack of reference voltage.
Q7: Can the SDA and SCL pins be connected directly to the microcontroller? A7: Yes, the SDA and SCL pins are designed to interface with I2C bus lines on a microcontroller or similar device.
Q8: Can the CAT24C64WI-GT3 be powered off and retain data? A8: Yes, the EEPROM is non-volatile, meaning it retains data even when the power is turned off.
Q9: How do I write data to the CAT24C64WI-GT3? A9: Data is written to the EEPROM via the SDA pin in I2C mode, with the SCL pin providing the necessary clocking.
Q10: What happens if I connect the SDA and SCL pins incorrectly? A10: Incorrect connections will prevent the I2C communication from working, resulting in no data transfer between the EEPROM and the master device.
Q11: Can I use the CAT24C64WI-GT3 with a 3.3V system? A11: Yes, the CAT24C64WI-GT3 operates with a supply voltage range of 2.5V to 5.5V, so it is fully compatible with 3.3V systems.
Q12: Is there a way to disable the I2C communication on the CAT24C64WI-GT3? A12: The I2C communication is only active when the appropriate address and data are provided via the SDA and SCL pins. Disconnecting these pins from the I2C bus will effectively "disable" communication.
Q13: How can I reset the CAT24C64WI-GT3 EEPROM? A13: The EEPROM does not have a dedicated reset pin. You can reset the device by toggling the power (VCC) or by implementing an external reset circuit.
Q14: How fast can the CAT24C64WI-GT3 communicate? A14: The CAT24C64WI-GT3 supports standard I2C speeds, typically up to 400 kHz (Fast mode).
Q15: How many bytes of memory does the CAT24C64WI-GT3 have? A15: The CAT24C64WI-GT3 has 64 Kbits of memory, or 8,192 bytes.
Q16: Can I use the CAT24C64WI-GT3 in automotive applications? A16: Yes, as long as the operating conditions meet the specified voltage range and temperature ratings, the CAT24C64WI-GT3 can be used in automotive applications.
Q17: How do I read data from the CAT24C64WI-GT3? A17: Data is read from the EEPROM via the SDA pin in I2C mode, synchronized by the clock signal on the SCL pin.
Q18: Is there a limitation on how many write cycles the CAT24C64WI-GT3 can handle? A18: The CAT24C64WI-GT3 can withstand up to 1 million write cycles, making it suitable for many types of applications.
Q19: Does the CAT24C64WI-GT3 require any additional components for operation? A19: No, besides the appropriate pull-up resistors on the SDA and SCL lines (if necessary), no additional components are required for operation.
Q20: What is the maximum number of devices that can be connected on the I2C bus with the CAT24C64WI-GT3? A20: Theoretically, up to 8 devices can be connected to the same I2C bus if different address combinations (A0, A1, A2) are used for each device.
This comprehensive guide provides the requested specifications and FAQ for the CAT24C64WI-GT3 EEPROM.
